Iowa provides special admission rules for government attorneys licensed in other jurisdictions under the Iowa House Counsel Rules.
Iowa also provides an Iowa Multijurisdictional Practice Rule (MJP) within its rules of professional conduct. Comment 16 to that rule provides an interpretation that exempts government attorneys from the unauthorized practice of law.
Please also see the Iowa Bar Reciprocity page to view the qualifications for Admission on Motion, and the Iowa Pro Hac Vice page to view the requirements for admission to a particular proceeding.